I have a simple iPhone app that has a tab bar and 3 tabs. Each tab loads as a separate nib with a corresponding controller. Each nib contains a tableview with some other con
And a how-to right from the horse's mouth here:
http://developer.apple.com/iphone/library/featuredarticles/ViewControllerPGforiPhoneOS/CombiningViewControllers/CombiningViewControllers.html#//apple_ref/doc/uid/TP40007457-CH104-SW2